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"Separating the two is probably not a good idea at this point," he told CNN.

The boys were born via cesarean section last September near Chicago, Illinois. They were attached by the crown of the head.

Nicole and 37-year-old Christian insisted the boys were perfect as they were.

But in order to let them lead a normal life, they traveled to Montefiore Hospital in the Bronx, New York, to have one of the world's most esteemed surgeons perform the incredibly rare operation to separate their heads.

The operation costs $2.5million.

"This is so hard. I'm not going to sugarcoat it," Nicole said before the operation.

The twins shared every second of their lives together until last month. Photo / Facebook